Sorry for the highjack bunnymom...
Cycling with fish is an old method. It does work but to keep the fish from suffering water changes are necessary and will cause your cycle to take much longer than necessary. Or, if you don't do the water changes, the fish may die. Here is an article on the nitrogen cycle to help you understand the process.
The fishless cycle is what we suggest. You can do a cycle without fish just using another source of ammonia to get you started. Using a raw shrimp from your grocery works well. You just throw it in and let it rot.
You should have a test kit to watch the progress of your cycle. This is necessary for the fish or fishless method.